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WELCOME
SEMINAR REPORT ON
HIGH PERFORMANCE CONCRETE USING FUMED SILICA
PRESENTED BY
APARNA G KRISHNA
S7 CIVIL
ROLL NO. 11
GUIDED BY Mrs. S. USHA Asst Professor Dept. of Civil Engineering
INTRODUCTION
• High performance concrete is a concrete having low water binder ratio. A value of 0.4 is suggested as boundary between usual concrete and high performance concrete.• It has high strength and durability. For high durability low permeability is required and to reduce permeability silica fume is used
DEFENITION
• It should have maximum water cement ratio of 0.4, a maximum durability of 80% and a minimum compressive strength of 69Mpa at 28 days.
DURABILITY OF HPC
From durability point of view, it is important to achieve low permeability as quick as possible.
FUMED SILICA
SiCl4+2 H2O SiO2 + 4HCl
MECHANISM OF HPC
EXPERIMENTAL STUDY
Materials
• Cement
• Water
• Coarse aggregate
• HRWRA
DESIGN MIX
Ratio of Cement fine and Coarse aggregate = 1: 1.35:1.68
W/(C+P) ratio = 0.31
Slump = 25 to 50mm
RESULTS AND DISCUSSIONS
Age
3 day
7 day
28 day
Average compressive strength
(Mpa)
24
40
63
Age
3 day
7 day
28 day
Average compressive strength
(Mpa)
31.5
43
64.5
Age
3 day
7 day
28 day
Average compressive strength
(Mpa)
32
43.5
66
Mineral admixture such as fumed silica is an ideal constituent' for high performance concrete as it has the inherent ability to contribute to continued strength development through their pozzolanic / cementations reactivity and to enhance durability and chemical resistance through their pore refinement and reduced sorptivity characteristics.
CONCLUSION
1. B.N.Krishnaswami & J.K. Dattetreya,(march 2007), Durability Aspect Of High Performance Concrete,Indian concrete journal , page 31-39
2. Dr.A.K.Mullick,(September 2005), High Performance Concrete In India, Indian Concrete journal, page 7-12
3.M.S.Shetty, Text book of concrete technology
REFERENCE
THANK YOU